For industrial applications the reproducibility of spectral measurements and sturdiness and durability of the measuring device is crucial. For reproducibility of spectral measurements between different devices and within the lifetime of the spectrometer, the slit and the position of the grating, the mirror and the detector must be the same. Only this way spectral evaluations, e.g. for the determination of certain analyte concentrations, can be transferred to equivalent spectrometers.

The raspberry spegg fulfills these requirements. Because of the monolithic setup the optical path is grounded over the entire lifetime. Each spectrometer is calibrated after production and does not need to be recalibrated. This manufacturing process ensures that the spectra of all raspberry spegg’s are comparable to each other. For each raspberry spegg, the calibration data is stored in the flash C of the microcontroller.

The electronic components of the raspberry spegg, including the integrated LED, also meet these requirements. E.g. no electrolytic capacitors with liquid electrolytes are used. The light source has its own electronically adjustable voltage source, and the current can be adjusted up to 200mA.

The electronics and the spectrometer of the raspberry spegg are adjusted robustly and space-saving to the raspberry pi.

With the 4″ 320×480 resistive Touchscreen GPIO pins 1-26 are used for power supply and communication. All other GPIO’s as well as the CSI Camera cable can be used with the raspberry spegg board.

The raspberry spegg has a voltage supply connection with a polyfuse, which can also be used to supply the raspberry pi.

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